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Fiber-optic spectroscopic rotational Raman lidar with visible wavelength fiber Bragg grating for atmospheric temperature measurement

Journal of Quantitative Spectroscopy and Radiative Transfer
DOI: 10.1016/j.jqsrt.2014.09.018
  • Pure Rotational Raman Lidar
  • Fiber-Optic Spectroscopic System
  • Fiber Bragg Grating
  • Visible Region
  • Atmospheric Temperature


Abstract A fiber-optic spectroscopic rotational Raman lidar is demonstrated with the visible wavelength fiber Bragg grating technique for profiling the atmospheric temperature. Two-channel pure rotational Raman optical signals are extracted from lidar echo signals by two sets of visible wavelength fiber Bragg gratings. The rejection-type of fiber Bragg grating in visible region is successfully fabricated through the zero-order nulled phase mask. Its most significant parameter, out-of-band rejection, for fiber-optic spectroscopic system is tested to ensure the spectral purity of rotational Raman channel. A temperature profile up to a 0.7-km height is obtained by pure rotational Raman lidar with 300-mJ laser pulse energy, and a 250-mm telescope. Preliminary results of observations show that this fiber-optic spectroscopic scheme with high mechanical stability has >70-dB suppression to elastic backscattering in lidar echo signals.

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